CVE-2026-59828CWE-200

Discourse: Hidden post revisions leak through adjacent visible diffs

Medium · published July 9, 2026

CVSS v3.1
5.3
EPSS
1%
Percentile
45.0
In the wild
Unconfirmed
What it is

Discourse is an open-source discussion platform. Prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5, post revisions that should be hidden from regular users could be leaked through visible diffs on adjacent revisions serialized by PostRevisionSerializer. This issue is fixed in versions 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5.

The record
Technical detail
CVSS v3.1
5.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00545 · 45.0th percentile
Weakness
CWE-200 · Exposure of Sensitive Information to an Unauthorized Actor
Published
2026-07-09T22:04Z
EPSS history
Timeline
  • 09 JUL 22:04Z
    Discourse: Hidden post revisions leak through adjacent visible diffs
    cvelistv5